添加热电阻/热电偶驱动芯片AD7793程序.

README.md

@@ -24,15 +24,16 @@ Onewire | 模拟单总线 | IO模拟
 
 外设 | 型号 | 原厂 | 接口 | 备注  
 --- | --- | --- | --- | --- 
-温度传感器 | LM75A	| NXP	| I2C	  
-LED恒流驱动 | LP55231 | TI | I2C  	
-EEPROM/FRAM | AT24Cxx | ATMEL | I2C  	
-EEPROM | ST25AAXX | ST | SPI  	
+温度传感器 | LM75A	| NXP	| I2C	  |
+LED恒流驱动 | LP55231 | TI | I2C  	|
+EEPROM/FRAM | AT24Cxx | ATMEL | I2C  	|
+EEPROM | ST25AAXX | ST | SPI  	|
 ADC | AD7684 | ADI | SPI | 3线SPI    
-步进电机驱动 | TMC2660 | TRINAMIC | SPI
+步进电机驱动 | TMC2660 | TRINAMIC | SPI|
 温度传感器 | DS18B20 | MAXIM | Onewire|    
 DAC | AD5290 | ADI | SPI | 3线SPI   	
-三轴加速度传感器 | LIS3DH | ST | I2C  
+三轴加速度传感器 | LIS3DH | ST | I2C  |
+热电阻/热电偶驱动芯片 | AD7793 | ADI | SPI |
 
 4.更新
 -

driver/ad7793.c

+
+#include <string.h>
+#include "stm32f10x.h"
+#include "ad7793.h"
+
+/* ad7793寄存器 */
+#define REG_COMM_STA	0x00	 /* 8bit,写时为通讯寄存器/读时为状态寄存器 */  
+#define REG_MODE		0x08	 /* 16bit,模式寄存器 */
+#define REG_CONFIG		0x10	 /* 16bit,配置寄存器 */
+#define	REG_DATA		0x18     /* 24bit,数据寄存器 */
+#define REG_ID			0x20	 /* 8bit,芯片ID寄存器 */
+#define	REG_IO			0x28	 /* 8bit,IO寄存器	*/
+#define	REG_IMBL		0x30	 /* 24bit,失调寄存器 */
+#define	REG_FULL		0x38	 /* 24bit,满量程寄存器 */
+
+/* ad7793读写指令 */
+#define READ_EN			0x40	 /* 读使能 */
+#define	SINGLE_CONVER	0x2000	 /* 单次转换 */
+#define	CONTINUE_CONVER	0x00	 /* 连续转换 */
+#define	CONTINUE_READ	0x20	 /* 连续读 */
+
+/* 恒流源控制 */
+#define CURRENT_OUT1_1	0x00	/* 两路电流正常输出到IO1、IO2 */
+#define CURRENT_OUT1_2	0x04	/* 两路电流输出IO1、IO2互换 */
+#define CURRENT_OUT1	0x08	/* 两路电流叠加输出到IO1，只对10uA和210uA有效 */
+#define CURRENT_OUT2	0x0C	/* 两路电流叠加输出到IO2，只对10uA和210uA有效 */
+#define CURRENT_10UA	0x01	/* 10uA电流 */
+#define CURRENT_210UA	0x02	/* 210uA电流 */
+#define CURRENT_1MA	    0x03	/* 1mA电流 */
+
+/* 配置寄存值 */
+#define	BIPOLAR		0x0000	 /* 双极性 */
+#define	UNIPOLAR	0x1000	 /* 单极性 */
+#define GAIN_1      0x0000	 /* 增益1~128 */
+#define GAIN_2      0x0100	 
+#define GAIN_4      0x0200	 
+#define GAIN_8      0x0300	 
+#define GAIN_16     0x0400	 
+#define GAIN_32     0x0500	 	
+#define GAIN_64     0x0600	   
+#define GAIN_128    0x0700	 
+
+#define OUTER_VREF  0x0000	 /* 外部参考源 */
+#define INNER_VREF  0x0080 	 /* 内部参考源 */
+
+#define NO_BUF		0x0000	 /* 无缓存 */
+#define USE_BUF		0x0010	 /* 使用缓存 */
+#define AIN_CH1     0x0000	 /* 检测通道1~3 */
+#define AIN_CH2     0x0001	
+#define AIN_CH3     0x0002	
+
+/* ad7793 工作模式选择 */
+#define MODE_NONE	    0x00    
+#define MODE_BIPOLAR	0x01	/* 双极性模式 */
+#define MODE_UNIPOLAR	0x02	/* 单极性模式 */
+#define MODE_2LINE_RTD	0x04	/* 两线RTD */
+#define MODE_3LINE_RTD	0x08	/* 三线RTD */
+#define MODE_4LINE_RTD	0x10	/* 四线RTD */
+
+struct _ad7793_info
+{
+	uint8_t mode;	/* 工作模式 */
+	uint16_t ref;   /* 参考电阻阻值, Ω */
+	uint16_t gain;  /* 增益 */
+	uint8_t id;		/* 芯片id */
+};
+
+/* ad7793 spi device */
+static struct spi_dev_device ad7793_spi_dev[1];
+
+/* mode select */
+static struct _ad7793_info s_ad7793_info =
+{
+	.mode = MODE_BIPOLAR|MODE_4LINE_RTD,/* 双精度/4线RTD */
+	.ref = 2000,	/* 2kΩ */
+	.gain = GAIN_1,
+};
+
+static void ad7793_spi_cs(uint8_t state)
+{
+    if (state)
+    {
+		GPIO_SetBits(GPIOA, GPIO_Pin_1);
+	}
+    else
+	{
+		GPIO_ResetBits(GPIOA, GPIO_Pin_1);
+	}
+}
+
+static uint8_t ad7793_spi_write(uint8_t addr, uint8_t *pbuf, uint8_t size)
+{
+	spi_send_then_send(&ad7793_spi_dev[0], &addr, 1, pbuf, size);
+	return size;
+}
+
+static uint8_t ad7793_spi_write_byte(uint8_t addr, uint8_t data)
+{
+	ad7793_spi_write(addr, &data, 1);
+	return 0x01;
+}
+
+static uint8_t ad7793_spi_write_word(uint8_t addr, uint16_t data)
+{
+  	uint8_t buf[2] = {0};
+	
+	buf[0] = (data>>8)&0xff;
+	buf[1] = data&0xff;
+	ad7793_spi_write(addr, &buf[0], 2);
+	
+	return 0x02;
+}
+
+static uint8_t ad7793_spi_write_3byte(uint8_t addr, uint32_t data)
+{
+  	uint8_t buf[3] = {0};
+	
+	buf[0] = (data>>16)&0xff;
+	buf[1] = (data>>8)&0xff;
+	buf[2] = data&0xff;
+	ad7793_spi_write(addr, &buf[0], 3);
+	
+	return 0x03;
+}
+
+static uint8_t ad7793_spi_read(uint8_t addr, uint8_t *pbuf, uint8_t size)
+{
+	spi_send_then_recv(&ad7793_spi_dev[0], &addr, 1, pbuf, size);
+	
+	return size;	
+}
+
+static void ad7793_soft_reset(void)
+{
+  	uint8_t buf[] ={0xff, 0xff, 0xff,0xff};
+	
+	ad7793_spi_write(REG_COMM_STA, &buf[0], 4);
+}
+
+static void ad7793_register_init(void)
+{
+  	uint16_t mode = 0x00;
+	
+	/* read chip id */
+	ad7793_spi_read(REG_ID, &s_ad7793_info.id, 1);
+	
+	/* 65db抑 */
+  	ad7793_spi_write_word(REG_MODE, 0x000A);
+
+	if (s_ad7793_info.mode&MODE_UNIPOLAR)
+	{
+		mode |= MODE_UNIPOLAR;
+	}
+	else if (s_ad7793_info.mode&MODE_BIPOLAR)
+	{
+		mode |= MODE_BIPOLAR;
+	}
+	
+	if (s_ad7793_info.gain > GAIN_128)
+	{
+		s_ad7793_info.gain = GAIN_128;
+	}
+	mode |= s_ad7793_info.gain;
+
+	/* 双极性/无增益/外部参考源/无缓存/通道AIN1 */
+	ad7793_spi_write_word(REG_CONFIG, mode|OUTER_VREF|NO_BUF|AIN_CH1);
+
+	/* 210uA恒流源输出 */
+	ad7793_spi_write_byte(REG_IO, CURRENT_OUT1_1|CURRENT_210UA);
+}
+
+int8_t ad7793_read_data(int32_t *ad_value)
+{
+  	int8_t ret = 0;
+	uint8_t temp = 0;
+	uint8_t buf[3] = {0};
+	
+	ad7793_spi_read(REG_COMM_STA|READ_EN, &temp ,1);/* 读取转换完成状态 */
+	
+	if (0xbf == (temp|0xbf))
+	{
+		ad7793_spi_read(REG_DATA|READ_EN, &buf[0] ,3);
+		*ad_value = (buf[0]<<16) | (buf[1]<<8) | buf[2];
+	}
+	else
+	{
+		/* todo，出错？ */
+	  	ret = -1;
+	}
+	return ret;
+}
+
+int8_t ad7793_init(struct spi_bus_device *spi_bus)
+{	
+    GPIO_InitTypeDef GPIO_InitStructure;
+	
+	if (NULL == spi_bus)
+	{
+		return -1;
+	}
+	
+    /* spi cs */ 
+	GPIO_SetBits(GPIOA, GPIO_Pin_1);
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA ,ENABLE);
+    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  
+    GPIO_Init(GPIOA, &GPIO_InitStructure);
+
+    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
+    GPIO_Init(GPIOA, &GPIO_InitStructure);
+    GPIO_SetBits(GPIOA,GPIO_Pin_11);
+	
+    /* device init */
+    ad7793_spi_dev[0].spi_cs  = ad7793_spi_cs;
+    ad7793_spi_dev[0].spi_bus = spi_bus;
+
+	ad7793_soft_reset();
+	ad7793_register_init();
+	
+	return 0;
+}
+
+int8_t ad7793_read_resistance(float *resistance)
+{
+  	int8_t ret = 0;
+	int32_t ad_value = 0;
+	uint8_t gain = 0;
+	
+	if (0 != ad7793_read_data(&ad_value))
+	{
+		return -1;
+	}
+	
+	gain = 0x01<<(s_ad7793_info.gain>>8);	/* 计算增益 */
+	
+	/* 根据不同模式计算 */
+	if (s_ad7793_info.mode&MODE_BIPOLAR)
+	{
+		*resistance = (float)s_ad7793_info.ref *(ad_value/0x7fffff-1) / gain;
+	}
+	else if (s_ad7793_info.mode&MODE_UNIPOLAR)
+	{
+		*resistance = (float)s_ad7793_info.ref * ad_value / 0xffffff / gain;
+	}
+	
+	if (s_ad7793_info.mode&MODE_3LINE_RTD)
+	{/* 三线RTD需要两路恒流源 */
+		*resistance *= 2;
+	}
+	
+	return ret;
+}

driver/ad7793.h

+
+#ifndef _AD7793_H_
+#define	_AD7793_H_
+
+#include "spi_core.h"
+
+extern int8_t ad7793_init(struct spi_bus_device *spi_bus);
+extern int8_t ad7793_read_resistance(float *resistance);
+
+#endif

project/Projects/MDK/Project.uvoptx

@@ -432,6 +432,18 @@
       <RteFlg>0</RteFlg>
       <bShared>0</bShared>
     </File>
+    <File>
+      <GroupNumber>4</GroupNumber>
+      <FileNumber>16</FileNumber>
+      <FileType>1</FileType>
+      <tvExp>0</tvExp>
+      <tvExpOptDlg>0</tvExpOptDlg>
+      <bDave2>0</bDave2>
+      <PathWithFileName>..\..\..\driver\ad7793.c</PathWithFileName>
+      <FilenameWithoutPath>ad7793.c</FilenameWithoutPath>
+      <RteFlg>0</RteFlg>
+      <bShared>0</bShared>
+    </File>
   </Group>
 
   <Group>
@@ -442,7 +454,7 @@
     <RteFlg>0</RteFlg>
     <File>
       <GroupNumber>5</GroupNumber>
-      <FileNumber>16</FileNumber>
+      <FileNumber>17</FileNumber>
       <FileType>1</FileType>
       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>
@@ -454,7 +466,7 @@
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     <File>
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+      <FileNumber>18</FileNumber>
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@@ -466,7 +478,7 @@
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@@ -478,7 +490,7 @@
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-      <FileNumber>19</FileNumber>
+      <FileNumber>20</FileNumber>
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@@ -490,7 +502,7 @@
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     <File>
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-      <FileNumber>20</FileNumber>
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@@ -502,7 +514,7 @@
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     <File>
       <GroupNumber>5</GroupNumber>
-      <FileNumber>21</FileNumber>
+      <FileNumber>22</FileNumber>
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       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>
@@ -514,7 +526,7 @@
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     <File>
       <GroupNumber>5</GroupNumber>
-      <FileNumber>22</FileNumber>
+      <FileNumber>23</FileNumber>
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       <tvExpOptDlg>0</tvExpOptDlg>
@@ -526,7 +538,7 @@
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     <File>
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+      <FileNumber>24</FileNumber>
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       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>
@@ -538,7 +550,7 @@
     </File>
     <File>
       <GroupNumber>5</GroupNumber>
-      <FileNumber>24</FileNumber>
+      <FileNumber>25</FileNumber>
       <FileType>1</FileType>
       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>
@@ -550,7 +562,7 @@
     </File>
     <File>
       <GroupNumber>5</GroupNumber>
-      <FileNumber>25</FileNumber>
+      <FileNumber>26</FileNumber>
       <FileType>1</FileType>
       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>
@@ -562,7 +574,7 @@
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+      <FileNumber>27</FileNumber>
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       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>
@@ -574,7 +586,7 @@
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+      <FileNumber>28</FileNumber>
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@@ -586,7 +598,7 @@
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@@ -598,7 +610,7 @@
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+      <FileNumber>30</FileNumber>
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@@ -610,7 +622,7 @@
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@@ -622,7 +634,7 @@
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-      <FileNumber>31</FileNumber>
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@@ -634,7 +646,7 @@
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       <GroupNumber>5</GroupNumber>
-      <FileNumber>32</FileNumber>
+      <FileNumber>33</FileNumber>
       <FileType>1</FileType>
       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>
@@ -646,7 +658,7 @@
     </File>
     <File>
       <GroupNumber>5</GroupNumber>
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+      <FileNumber>34</FileNumber>
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@@ -658,7 +670,7 @@
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     <File>
       <GroupNumber>5</GroupNumber>
-      <FileNumber>34</FileNumber>
+      <FileNumber>35</FileNumber>
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       <tvExp>0</tvExp>
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@@ -670,7 +682,7 @@
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     <File>
       <GroupNumber>5</GroupNumber>
-      <FileNumber>35</FileNumber>
+      <FileNumber>36</FileNumber>
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@@ -682,7 +694,7 @@
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@@ -694,7 +706,7 @@
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-      <FileNumber>37</FileNumber>
+      <FileNumber>38</FileNumber>
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       <tvExp>0</tvExp>
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@@ -706,7 +718,7 @@
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-      <FileNumber>38</FileNumber>
+      <FileNumber>39</FileNumber>
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       <tvExp>0</tvExp>
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@@ -718,7 +730,7 @@
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     <File>
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-      <FileNumber>39</FileNumber>
+      <FileNumber>40</FileNumber>
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       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>
@@ -730,7 +742,7 @@
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     <File>
       <GroupNumber>5</GroupNumber>
-      <FileNumber>40</FileNumber>
+      <FileNumber>41</FileNumber>
       <FileType>1</FileType>
       <tvExp>0</tvExp>
       <tvExpOptDlg>0</tvExpOptDlg>

project/Projects/MDK/Project.uvprojx

@@ -471,6 +471,11 @@
               <FileType>1</FileType>
               <FilePath>..\..\..\driver\24clxx.c</FilePath>
             </File>
+            <File>
+              <FileName>ad7793.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\..\..\driver\ad7793.c</FilePath>
+            </File>
           </Files>
         </Group>
         <Group>

project/Source/App/main.c

@@ -8,6 +8,7 @@
 #include "ad5290.h"
 #include "tmc2660.h"
 #include "24clxx.h"
+#include "ad7793.h"
 
 struct i2c_dev_device i2c0;
 struct spi_bus_device spi_bus0;
@@ -26,6 +27,7 @@ int main(void)
 	ee_25xx_init(&spi_bus1);
 	ad7684_init(&spi_bus1);
 	ad5290_init(&spi_bus1);
+	ad7793_init(&spi_bus0);
 	tmc2660_init(&spi_bus0);
 	ee_24clxx_init(&i2c0);